#!/usr/env/bin python
# -*- coding: utf-8 -*-

# @Time    : 2019/11/19 15:12|15:12
# @Author  : yangdingyi
# @File    : 反转字符串
# @Software: PyCharm
from typing import List


class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        # return s.reverse()
        i, j = 0, len(s)-1
        while i < j:
            s[i], s[j] = s[j], s[i]
            i, j = i + 1, j - 1
        return s
